通过扭曲laser驱动的两个等离子体激元衰减产生轴向磁场
Generating axial magnetic fields via two plasmon decay driven by a twisted laser
摘要：
提出了一种在非相对论激光强度范围内产生轴向磁场的新方法，即利用带有轨道角动量（OAM）的扭曲光激发等离子体中的双等离子体衰变（TPD）。通过三维流体模拟和理论研究了OAM光在拉盖尔-高斯（LG）模式下驱动TPD的生长。基于电子等离子体波（EPWs）由多个局部平面波激光器局部驱动的假设的理论预测了与泵浦激光场的峰值幅度成正比的最大增长率，并通过模拟进行了验证。从理论和模拟两方面证明了OAM从激光器到TPD子体EWP传输过程中的守恒性。该理论预测了TPD通过OAM吸收产生~ 40 T的轴向磁场，在高能量密度物理领域具有广阔的应用前景。
英文摘要：
We propose a new way of axial magnetic fields generation in a non-relativistic laser intensity regime by using a twisted light carrying orbital angular momentum (OAM) to stimulate two-plasmon decay (TPD) in a plasma. The growth of TPD driven by an OAM light in a Laguerre-Gauss (LG) mode is investigated through three dimensional fluid simulations and theory. A theory based on the assumption that the electron plasma waves (EPWs) are locally driven by a number of local plane-wave lasers predicts the maximum growth rate proportional to the peak amplitude of the pump laser field and is verified by the simulations. The OAM conservation during its transportation from the laser to the TPD daughter EWPs is shown by both the theory and the simulations. The theory predicts generation of ~40T axial magnetic fields through the OAM absorption via TPD, which has perspective applications in the field of high energy density physics.
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